Linux Distros Unpatched Vulnerability : CVE-2026-16762

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(371712);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/28");

  script_cve_id("CVE-2026-16762");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-16762");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause
    disproportionate CPU consumption during parsing, making the application unresponsive (denial of service).
    Exploitation requires only that the application parse attacker-influenced XML; no authentication,
    privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality
    or integrity  no data disclosure, data modification, or code execution  and the impact is contained to
    the affected process. (CVE-2026-16762)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-16762");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-16762");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_supplemental", value:"CVSS:4.0/S:P/AU:Y/R:A/RE:L");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-16762");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:qtbase-opensource-src-gles");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:qt6-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:qtbase-opensource-src");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:qtbase-opensource-src-gles");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-26.04", "Host/OS/Ubuntu Linux-26.10");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "libqt5concurrent5"},
          {"reference": "libqt5core5a"},
          {"reference": "libqt5dbus5"},
          {"reference": "libqt5gui5"},
          {"reference": "libqt5gui5-gles"},
          {"reference": "libqt5network5"},
          {"reference": "libqt5opengl5"},
          {"reference": "libqt5opengl5-dev"},
          {"reference": "libqt5printsupport5"},
          {"reference": "libqt5sql5"},
          {"reference": "libqt5sql5-ibase"},
          {"reference": "libqt5sql5-mysql"},
          {"reference": "libqt5sql5-odbc"},
          {"reference": "libqt5sql5-psql"},
          {"reference": "libqt5sql5-sqlite"},
          {"reference": "libqt5sql5-tds"},
          {"reference": "libqt5test5"},
          {"reference": "libqt5widgets5"},
          {"reference": "libqt5xml5"},
          {"reference": "libqt6concurrent6"},
          {"reference": "libqt6core6"},
          {"reference": "libqt6dbus6"},
          {"reference": "libqt6gui6"},
          {"reference": "libqt6network6"},
          {"reference": "libqt6opengl6"},
          {"reference": "libqt6opengl6-dev"},
          {"reference": "libqt6openglwidgets6"},
          {"reference": "libqt6printsupport6"},
          {"reference": "libqt6sql6"},
          {"reference": "libqt6sql6-ibase"},
          {"reference": "libqt6sql6-mysql"},
          {"reference": "libqt6sql6-odbc"},
          {"reference": "libqt6sql6-psql"},
          {"reference": "libqt6sql6-sqlite"},
          {"reference": "libqt6test6"},
          {"reference": "libqt6widgets6"},
          {"reference": "libqt6xml6"},
          {"reference": "qmake6"},
          {"reference": "qmake6-bin"},
          {"reference": "qt5-flatpak-platformtheme"},
          {"reference": "qt5-gtk-platformtheme"},
          {"reference": "qt5-qmake"},
          {"reference": "qt5-qmake-bin"},
          {"reference": "qt5-xdgdesktopportal-platformtheme"},
          {"reference": "qt6-base-dev"},
          {"reference": "qt6-base-dev-tools"},
          {"reference": "qt6-base-private-dev"},
          {"reference": "qt6-gtk-platformtheme"},
          {"reference": "qt6-qpa-plugins"},
          {"reference": "qt6-xdgdesktopportal-platformtheme"},
          {"reference": "qtbase5-dev"},
          {"reference": "qtbase5-dev-tools"},
          {"reference": "qtbase5-doc"},
          {"reference": "qtbase5-doc-dev"},
          {"reference": "qtbase5-doc-html"},
          {"reference": "qtbase5-examples"},
          {"reference": "qtbase5-gles-dev"},
          {"reference": "qtbase5-private-dev"},
          {"reference": "qtbase5-private-gles-dev"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "libqt5concurrent5t64"},
          {"reference": "libqt5core5t64"},
          {"reference": "libqt5dbus5t64"},
          {"reference": "libqt5gui5-gles"},
          {"reference": "libqt5gui5t64"},
          {"reference": "libqt5network5t64"},
          {"reference": "libqt5opengl5-dev"},
          {"reference": "libqt5opengl5t64"},
          {"reference": "libqt5printsupport5t64"},
          {"reference": "libqt5sql5-ibase"},
          {"reference": "libqt5sql5-mysql"},
          {"reference": "libqt5sql5-odbc"},
          {"reference": "libqt5sql5-psql"},
          {"reference": "libqt5sql5-sqlite"},
          {"reference": "libqt5sql5-tds"},
          {"reference": "libqt5sql5t64"},
          {"reference": "libqt5test5t64"},
          {"reference": "libqt5widgets5t64"},
          {"reference": "libqt5xml5t64"},
          {"reference": "libqt6concurrent6"},
          {"reference": "libqt6core6t64"},
          {"reference": "libqt6dbus6"},
          {"reference": "libqt6gui6"},
          {"reference": "libqt6network6"},
          {"reference": "libqt6opengl6"},
          {"reference": "libqt6openglwidgets6"},
          {"reference": "libqt6printsupport6"},
          {"reference": "libqt6sql6"},
          {"reference": "libqt6sql6-ibase"},
          {"reference": "libqt6sql6-mysql"},
          {"reference": "libqt6sql6-odbc"},
          {"reference": "libqt6sql6-psql"},
          {"reference": "libqt6sql6-sqlite"},
          {"reference": "libqt6test6"},
          {"reference": "libqt6widgets6"},
          {"reference": "libqt6xml6"},
          {"reference": "qmake6"},
          {"reference": "qmake6-bin"},
          {"reference": "qt5-gtk-platformtheme"},
          {"reference": "qt5-qmake"},
          {"reference": "qt5-qmake-bin"},
          {"reference": "qt5-xdgdesktopportal-platformtheme"},
          {"reference": "qt6-base-dev"},
          {"reference": "qt6-base-dev-tools"},
          {"reference": "qt6-base-doc"},
          {"reference": "qt6-base-doc-dev"},
          {"reference": "qt6-base-doc-html"},
          {"reference": "qt6-base-examples"},
          {"reference": "qt6-base-private-dev"},
          {"reference": "qt6-gtk-platformtheme"},
          {"reference": "qt6-qpa-plugins"},
          {"reference": "qt6-xdgdesktopportal-platformtheme"},
          {"reference": "qtbase5-dev"},
          {"reference": "qtbase5-dev-tools"},
          {"reference": "qtbase5-doc"},
          {"reference": "qtbase5-doc-dev"},
          {"reference": "qtbase5-doc-html"},
          {"reference": "qtbase5-examples"},
          {"reference": "qtbase5-gles-dev"},
          {"reference": "qtbase5-private-dev"},
          {"reference": "qtbase5-private-gles-dev"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "libqt5concurrent5t64"},
          {"reference": "libqt5core5t64"},
          {"reference": "libqt5dbus5t64"},
          {"reference": "libqt5gui5-gles"},
          {"reference": "libqt5gui5t64"},
          {"reference": "libqt5network5t64"},
          {"reference": "libqt5opengl5-dev"},
          {"reference": "libqt5opengl5t64"},
          {"reference": "libqt5printsupport5t64"},
          {"reference": "libqt5sql5-ibase"},
          {"reference": "libqt5sql5-mysql"},
          {"reference": "libqt5sql5-odbc"},
          {"reference": "libqt5sql5-psql"},
          {"reference": "libqt5sql5-sqlite"},
          {"reference": "libqt5sql5-tds"},
          {"reference": "libqt5sql5t64"},
          {"reference": "libqt5test5t64"},
          {"reference": "libqt5widgets5t64"},
          {"reference": "libqt5xml5t64"},
          {"reference": "qt5-gtk-platformtheme"},
          {"reference": "qt5-qmake"},
          {"reference": "qt5-qmake-bin"},
          {"reference": "qt5-xdgdesktopportal-platformtheme"},
          {"reference": "qtbase5-dev"},
          {"reference": "qtbase5-dev-tools"},
          {"reference": "qtbase5-doc"},
          {"reference": "qtbase5-doc-dev"},
          {"reference": "qtbase5-doc-html"},
          {"reference": "qtbase5-examples"},
          {"reference": "qtbase5-gles-dev"},
          {"reference": "qtbase5-private-dev"},
          {"reference": "qtbase5-private-gles-dev"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "qtbase-opensource-src-gles"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "qtbase-opensource-src-gles"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "qtbase-opensource-src-gles"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "qtbase-opensource-src-gles"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "qtbase-opensource-src-gles"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.10",
        "pkgs": [
          {"reference": "qtbase-opensource-src-gles"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}